How to Patch Wood Siding

Place a full-length piece of the damaged siding on the face of the replacement. Line up the ends, and, using the old piece as a guide, mark the new clapboard with a utility knife. Score the cut line with the utility knife, guided by a square. (Scoring prevents the wood from chipping when you cut it.) With a handsaw, cut the new piece of siding on the waste side of the line. Angle the blade slightly to cut a bevel toward the side that will be against the house. This leaves a little extra space for caulk.